Messages in this thread | | | Subject | Re: [1/2] 2.6.22-rc5: known regressions with patches | From | Arjan van de Ven <> | Date | Wed, 20 Jun 2007 16:15:53 -0700 |
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On Wed, 2007-06-20 at 19:07 -0400, Dave Jones wrote: > On Wed, Jun 20, 2007 at 03:38:06PM -0700, Linus Torvalds wrote: > > > And yes, that patch already got merged. However, the patch to *allow* > > Kprobes with DEBUG_RODATA is not, and will not be. It's not a regression, > > and quite frankly, I don't think I would even want that patch. > > > > Kprobes fundamntally disagrees with DEBUG_RODATA, there's no point in > > "working around it". Better just admit it. > > Surely the fundamental disagreement is only due to DEBUG_RODATA > covering write-protection of both .text, and .rodata ? > I can see value in having a kernel that supports kprobes, whilst > at the same point, raising red flags if something writes into > a const string. With my distro kernel maintainer hat on, I always > hate these 'pick one' decisions, because I always get convincing > arguments from proponents of both sides. > > Was it always this way? I thought DEBUG_RODATA initially just > covered, well.. rodata. And kprobes only wants to change .text > doesn't it ?
no this got "fixed" recently. It used to only cover data. Andi merged a patch to make it cover text too.. imo we should reverse that, or make the check better and not have it cover text if kprobes is active. I can do the later if people are ok with that, it's approximately 3 lines of code.
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